Anna’s hummingbird - Calypte anna by Janis Morrison Via Flickr: Male and female Anna's Hummingbirds are together only long enough to mate, they do not form a lasting bond. The female alone will build the cup shaped nest made of plant fibres, spider webs, feathers with a lichen exterior for camouflage. It is made of these soft materials so that as the chicks grow, the nest expands with them. This nest is about the size of an apricot, not easy to spot. There are typically 1 or 2 eggs per nest about the size and shape of a small jellybean. The eggs are normally laid on different days. The female will incubate the eggs for 14-19 days. When the little hummers hatch they weigh only 0.62 gm (0.02 oz) and are just 2.54 cm (1 in) long. She will then feed and nurture the chicks herself until they become independent at 18-23 days. She feeds her young by eating bugs and nectar and then regurgitates the food into the chick’s mouths. This is what she is doing in this image.